Version:           1.2.3 (using KDE KDE 3.5.3)
Installed from:    Debian testing/unstable Packages
OS:                Linux

I'm using the current Debian Sid packages of KDE 3.5.3/Kontact 1.2.3.

The first three steps of the following procedure to reproduce the crash are just to make sure the environment is a bit more defined. I get i different stack trace when performing the same steps with my real-life account which I'm using for some time already. See bug 128230.

Steps to reproduce:
1. Create a new test account e.g. of the name "test".
2. Log into the test account (sux - test).
3. Remove your KDE-settings (rm -rf ~/.kde).
4. Start Kontact.
5. Click on the "Feeds" icon.
6. Click on the "Contacts" icon.
7. Select "File|New Contact...".
8. Enter some data (e.g. Name "test") and press "OK".
9. Select "File|Quit".

This crashes Kontact every time with the following backtrace:

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1477781184 (LWP 22976)]
[New Thread -1511609424 (LWP 23038)]
[New Thread -1503216720 (LWP 23037)]
[New Thread -1494824016 (LWP 23036)]
[New Thread -1486431312 (LWP 23035)]
[KCrash handler]
#6  0x4d05eccc in QGList::first () from /usr/lib/libqt-mt.so.3
#7  0x4cea734b in QPtrList<QSplitterLayoutStruct>::first ()
   from /usr/lib/libqt-mt.so.3
#8  0x4cea6fbd in QSplitter::sizes () from /usr/lib/libqt-mt.so.3
#9  0xa7b2814b in Akregator::View::saveSettings (this=0x85976f0)
    at /tmp/buildd/kdepim-3.5.3/build-tree/kdepim-3.5.3/akregator/src/akregator_view.cpp:420
#10 0xa7b2834f in Akregator::Part::saveSettings (this=0x85af708)
    at /tmp/buildd/kdepim-3.5.3/build-tree/kdepim-3.5.3/akregator/src/akregator_part.cpp:296
#11 0xa7b31e7f in Akregator::Part::slotOnShutdown (this=0x85af708)
    at /tmp/buildd/kdepim-3.5.3/build-tree/kdepim-3.5.3/akregator/src/akregator_part.cpp:261
#12 0xa7b31fd2 in Akregator::Part::qt_invoke (this=0x85af708, _id=16, 
    _o=0xafa107ac) at ./akregator_part.moc:222
#13 0x4cd6054b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#14 0x4cd60fdc in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#15 0x4d3ed15c in KApplication::shutDown () from /usr/lib/libkdecore.so.4
#16 0x4d40355b in KApplication::qt_emit () from /usr/lib/libkdecore.so.4
#17 0x4d40359b in KUniqueApplication::qt_emit () from /usr/lib/libkdecore.so.4
#18 0x4cd6064c in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#19 0x4cd60fdc in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#20 0x4d0ea79d in QApplication::aboutToQuit () from /usr/lib/libqt-mt.so.3
#21 0x4cd0f313 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#22 0x4ccf53b9 in QApplication::enter_loop () from /usr/lib/libqt-mt.so.3
#23 0x4de941f0 in KIO::NetAccess::enter_loop () from /usr/lib/libkio.so.4
#24 0x4ded0599 in KIO::NetAccess::synchronousRunInternal ()
   from /usr/lib/libkio.so.4
#25 0x4df0ebb1 in KIO::NetAccess::synchronousRun () from /usr/lib/libkio.so.4
#26 0xa7cf8d22 in KABC::ResourceFile::save () from /usr/lib/libkabc_file.so.1
#27 0x4e23f216 in KABC::AddressBook::save () from /usr/lib/libkabc.so.1
#28 0x4e2542a6 in KABC::StdAddressBook::saveAll () from /usr/lib/libkabc.so.1
#29 0x4e254438 in KABC::StdAddressBook::~StdAddressBook ()
   from /usr/lib/libkabc.so.1
#30 0x4e243e92 in KABC::StdAddressBook::close () from /usr/lib/libkabc.so.1
#31 0x4d79d3f4 in ~KABCore (this=0x86b3308)
    at /tmp/buildd/kdepim-3.5.3/build-tree/kdepim-3.5.3/kaddressbook/kabcore.cpp:193
#32 0x4cd98ffd in QWidget::~QWidget () from /usr/lib/libqt-mt.so.3
#33 0x4d5b2a7d in KParts::Part::~Part () from /usr/lib/libkparts.so.2
#34 0x4d5b9cbd in KParts::ReadOnlyPart::~ReadOnlyPart ()
   from /usr/lib/libkparts.so.2
#35 0xa76a8bbb in ~KAddressbookPart (this=0x869d480)
    at /tmp/buildd/kdepim-3.5.3/build-tree/kdepim-3.5.3/kaddressbook/kaddressbook_part.cpp:78
#36 0x08060a38 in ~MainWindow (this=0x815d4a8)
    at /tmp/buildd/kdepim-3.5.3/build-tree/kdepim-3.5.3/kontact/src/mainwindow.cpp:190
#37 0x4cd5d7cc in QObject::event () from /usr/lib/libqt-mt.so.3
#38 0x4cd9ab9a in QWidget::event () from /usr/lib/libqt-mt.so.3
#39 0x4ce6cbfc in QMainWindow::event () from /usr/lib/libqt-mt.so.3
#40 0x4ccf687a in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#41 0x4ccf75f5 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#42 0x4d4b032e in KApplication::notify () from /usr/lib/libkdecore.so.4
#43 0x4cc88001 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#44 0x4ccf7ec5 in QApplication::sendPostedEvents () from /usr/lib/libqt-mt.so.3
#45 0x4cd0f327 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#46 0x4cd0f17a in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#47 0x4ccf538d in QApplication::exec () from /usr/lib/libqt-mt.so.3
#48 0x0805ac3f in main (argc=141039064, argv=0xafa114a4)
    at /tmp/buildd/kdepim-3.5.3/build-tree/kdepim-3.5.3/kontact/src/main.cpp:161
#49 0x4a2cdeb0 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#50 0x080582b1 in _start () at ../sysdeps/i386/elf/start.S:119